Communication noise-reducing circuit and noise-reducing method

Abstract

The invention is applicable in the field of communication and provides a communication noise-reducing circuit and a noise-reducing method. The communication noise-reducing circuit comprises a main microphone, a secondary microphone, a differential amplifier, a mixed amplifier, a comparator and an analog switch, wherein the mixed amplifier is used for receiving audio signals acquired by the main microphone and the secondary microphone and performing mixed amplification processing; the comparator acquires an audio signal which is subjected to differential amplification processing by the differential amplifier, compares the audio signal subjected to differential amplification processing with a preset threshold signal to obtain a comparison result and outputting the comparison result to the analog switch; and the analog switch receives the comparison result output by the comparator and selects the audio signal subjected to differential amplification processing or the audio signal subjected to mixed amplification processing according to the comparison result to output. The communication noise-reducing circuit can automatically identify a communication environment to perform noise-reducing processing, so the communication noise-reducing circuit is very convenient for a user to use.

Description

technical field

[0001] The invention relates to signal processing in the communication field, in particular to a circuit for noise reduction processing. Background technique

[0002] There is a need for noise reduction when talking in a noisy environment. At present, the dual-mic noise reduction on mobile phones is to place a microphone on the bottom and top of the mobile phone, and use the differential principle to filter out almost the same environmental noise reaching the two microphones. The distance between the speaker's mouth and the microphone is different, and the signal size entering the microphone is different, and the normal call sound can be partially preserved after the difference. But the ensuing problem is that due to the limited length of the mobile phone, the distance between the two microphones relative to the human mouth is not much different, which requires the mouth to be as close as possible to the main microphone when speaking, so that the normal speec...

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